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href="/front/base/JS练习/03.html#基于js实现ajax请求并发请求的控制" class="sidebar-link">基于JS实现Ajax请求并发请求的控制</a></li><li class="sidebar-sub-header"><a href="/front/base/JS练习/03.html#手写merge合并" class="sidebar-link">手写merge合并</a></li><li class="sidebar-sub-header"><a href="/front/base/JS练习/03.html#手写aop切片编程" class="sidebar-link">手写AOP切片编程</a></li><li class="sidebar-sub-header"><a href="/front/base/JS练习/03.html#手写geturlparam" class="sidebar-link">手写getUrlParam</a></li></ul></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h2 id="手写防抖函数"><a href="#手写防抖函数" class="header-anchor">#</a> 手写防抖函数</h2> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">function</span> <span class="token function">debounce</span><span class="token punctuation">(</span><span class="token parameter">fn<span class="token punctuation">,</span> delay</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">let</span> timer <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
  <span class="token keyword">return</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> context <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
    <span class="token keyword">const</span> args <span class="token operator">=</span> arguments<span class="token punctuation">;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>timer<span class="token punctuation">)</span> <span class="token function">clearTimeout</span><span class="token punctuation">(</span>timer<span class="token punctuation">)</span><span class="token punctuation">;</span>
    timer <span class="token operator">=</span> <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token function">fn</span><span class="token punctuation">.</span><span class="token function">apply</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> args<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span> delay<span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="手写节流函数"><a href="#手写节流函数" class="header-anchor">#</a> 手写节流函数</h2> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">function</span> <span class="token function">throttle</span><span class="token punctuation">(</span><span class="token parameter">fn<span class="token punctuation">,</span> interval</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">let</span> last <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
  <span class="token keyword">return</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> now <span class="token operator">=</span> Date<span class="token punctuation">.</span><span class="token function">now</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">const</span> context <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
    <span class="token keyword">const</span> args <span class="token operator">=</span> arguments<span class="token punctuation">;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>now <span class="token operator">-</span> last <span class="token operator">&gt;=</span> interval<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token function">fn</span><span class="token punctuation">.</span><span class="token function">apply</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> args<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="手写加强版节流"><a href="#手写加强版节流" class="header-anchor">#</a> 手写加强版节流</h2> <p>防抖有时触发的太频繁，可能会迟迟没有响应，我们需要将防抖和节流组合下避免这种问题：</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">function</span> <span class="token function">throttle</span><span class="token punctuation">(</span><span class="token parameter">fn<span class="token punctuation">,</span> delay</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">let</span> last <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">,</span> timer <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
  <span class="token keyword">return</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> context <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
    <span class="token keyword">const</span> args <span class="token operator">=</span> arguments<span class="token punctuation">;</span>
    <span class="token keyword">const</span> now <span class="token operator">=</span> Date<span class="token punctuation">.</span><span class="token function">now</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>now <span class="token operator">-</span> last <span class="token operator">&lt;</span> delay<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token function">clearTimeout</span><span class="token punctuation">(</span>timer<span class="token punctuation">)</span><span class="token punctuation">;</span>
      timer <span class="token operator">=</span> <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        last <span class="token operator">=</span> now<span class="token punctuation">;</span>
        <span class="token function">fn</span><span class="token punctuation">.</span><span class="token function">apply</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> args<span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token punctuation">}</span><span class="token punctuation">,</span> delay<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token keyword">else</span> <span class="token punctuation">{</span>
      last <span class="token operator">=</span> now<span class="token punctuation">;</span>
      <span class="token function">fn</span><span class="token punctuation">.</span><span class="token function">apply</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> args<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="手写懒加载"><a href="#手写懒加载" class="header-anchor">#</a> 手写懒加载</h2> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">let</span> num <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> imgs <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementsByTagName</span><span class="token punctuation">(</span><span class="token string">'img'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> viewHeight <span class="token operator">=</span> window<span class="token punctuation">.</span>innerHeight <span class="token operator">||</span> document<span class="token punctuation">.</span>documentElement<span class="token punctuation">.</span>clientHeight<span class="token punctuation">;</span>

<span class="token keyword">function</span> <span class="token function">lazyload</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> i <span class="token operator">=</span> num<span class="token punctuation">,</span> len <span class="token operator">=</span> imgs<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i <span class="token operator">&lt;</span> len<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> distance <span class="token operator">=</span> viewHeight <span class="token operator">-</span> imgs<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">getBoundingClientRect</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span>top
    <span class="token keyword">if</span> <span class="token punctuation">(</span>distance <span class="token operator">&gt;=</span><span class="token number">0</span> <span class="token punctuation">)</span> <span class="token punctuation">{</span>
      imgs<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span>src <span class="token operator">=</span> imgs<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">getAttribute</span><span class="token punctuation">(</span><span class="token string">'data-src'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      num <span class="token operator">=</span> i <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token function">throttle</span><span class="token punctuation">(</span><span class="token parameter">fn<span class="token punctuation">,</span> interval</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">let</span> last <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
  <span class="token keyword">return</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> context <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
    <span class="token keyword">const</span> args <span class="token operator">=</span> arguments<span class="token punctuation">;</span>
    <span class="token keyword">const</span> now <span class="token operator">=</span> Date<span class="token punctuation">.</span><span class="token function">now</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>now <span class="token operator">-</span> last <span class="token operator">&gt;=</span> interval<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token function">fn</span><span class="token punctuation">.</span><span class="token function">apply</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> args<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

window<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'scroll'</span><span class="token punctuation">,</span> <span class="token function">throttle</span><span class="token punctuation">(</span>lazyload<span class="token punctuation">,</span> <span class="token number">300</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><h2 id="手写jsonp"><a href="#手写jsonp" class="header-anchor">#</a> 手写jsonp</h2> <div class="language-js extra-class"><pre class="language-js"><code></code></pre></div><h2 id="手写ajax"><a href="#手写ajax" class="header-anchor">#</a> 手写ajax</h2> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token keyword">function</span> <span class="token function">ajax</span><span class="token punctuation">(</span><span class="token punctuation">{</span> url <span class="token operator">=</span> <span class="token string">''</span><span class="token punctuation">,</span> method <span class="token operator">=</span> <span class="token string">'GET'</span><span class="token punctuation">,</span> data <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> success <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">,</span> fail <span class="token operator">=</span> <span class="token keyword">null</span> <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token keyword">const</span> xhr <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">XMLHttpRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

	<span class="token keyword">const</span> isGet <span class="token operator">=</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">^(GET|DELETE|HEAD|OPTIONS)$</span><span class="token regex-delimiter">/</span><span class="token regex-flags">i</span></span><span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span>method<span class="token punctuation">)</span><span class="token punctuation">;</span>

	<span class="token keyword">if</span> <span class="token punctuation">(</span>isGet<span class="token punctuation">)</span> <span class="token punctuation">{</span>
		url <span class="token operator">=</span> url <span class="token operator">+</span> <span class="token string">'?'</span> <span class="token operator">+</span> <span class="token function">toQuery</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">;</span>
		data <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
		data <span class="token operator">=</span> <span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>

	xhr<span class="token punctuation">.</span><span class="token function">open</span><span class="token punctuation">(</span>method<span class="token punctuation">,</span> url<span class="token punctuation">)</span><span class="token punctuation">;</span>
	xhr<span class="token punctuation">.</span><span class="token function-variable function">onreadystatechange</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">^2\d{2}$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span>xhr<span class="token punctuation">.</span>status<span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> xhr<span class="token punctuation">.</span>readyState <span class="token operator">===</span> <span class="token number">4</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
			<span class="token keyword">typeof</span> success <span class="token operator">===</span> <span class="token string">'function'</span> <span class="token operator">?</span> <span class="token function">success</span><span class="token punctuation">(</span>xhr<span class="token punctuation">.</span>responseText<span class="token punctuation">)</span> <span class="token operator">:</span> <span class="token string">''</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span><span class="token keyword">else</span> <span class="token punctuation">{</span>
      <span class="token keyword">typeof</span> fail <span class="token operator">===</span> <span class="token string">'function'</span> <span class="token operator">?</span> <span class="token function">fail</span><span class="token punctuation">(</span>xhr<span class="token punctuation">.</span>responseText<span class="token punctuation">)</span> <span class="token operator">:</span> <span class="token string">''</span>
    <span class="token punctuation">}</span>
	<span class="token punctuation">}</span><span class="token punctuation">;</span>
	xhr<span class="token punctuation">.</span><span class="token function">send</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token function">toQuery</span><span class="token punctuation">(</span><span class="token parameter">obj</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token keyword">let</span> str <span class="token operator">=</span> <span class="token string">''</span><span class="token punctuation">;</span>
	<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> key <span class="token keyword">in</span> obj<span class="token punctuation">)</span> <span class="token punctuation">{</span>
		str <span class="token operator">+=</span> <span class="token string">'&amp;'</span> <span class="token operator">+</span> key <span class="token operator">+</span> <span class="token string">'='</span> <span class="token operator">+</span> obj<span class="token punctuation">[</span>key<span class="token punctuation">]</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	<span class="token keyword">return</span> str<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h3 id="你认为ajax的意义是什么"><a href="#你认为ajax的意义是什么" class="header-anchor">#</a> 你认为ajax的意义是什么？</h3> <p>局部刷新</p> <h3 id="ajax、-ajax、axios、fetch对比"><a href="#ajax、-ajax、axios、fetch对比" class="header-anchor">#</a> ajax、$.ajax、axios、fetch对比？</h3> <p>ajax是基于XMLHttpRequest的</p> <p>$.ajax是对ajax的封装，基于回调函数</p> <p>axios是基于promise对ajax的封装</p> <p>Fetch是es6中新增的通信方案，它不是ajax，它本身实现数据通信就是基于promise管理的。</p> <h2 id="手写call函数"><a href="#手写call函数" class="header-anchor">#</a> 手写call函数</h2> <p>es5</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token operator">~</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">proto</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  proto<span class="token punctuation">.</span><span class="token function-variable function">myCall</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">context</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">var</span> args <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">splice</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>arguments<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    context <span class="token operator">=</span> <span class="token function">Object</span><span class="token punctuation">(</span>context<span class="token punctuation">)</span> <span class="token operator">||</span> window<span class="token punctuation">;</span>
    context<span class="token punctuation">.</span>fn <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
    <span class="token keyword">var</span> res <span class="token operator">=</span> <span class="token function">eval</span><span class="token punctuation">(</span><span class="token string">'context.fn('</span> <span class="token operator">+</span> args <span class="token operator">+</span> <span class="token string">')'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">delete</span> context<span class="token punctuation">.</span>fn<span class="token punctuation">;</span>
    <span class="token keyword">return</span> res<span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">(</span><span class="token class-name">Function</span><span class="token punctuation">.</span>prototype<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><p>es6</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">proto</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  proto<span class="token punctuation">.</span><span class="token function-variable function">myCall</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">context <span class="token operator">=</span> <span class="token function">Object</span><span class="token punctuation">(</span>context<span class="token punctuation">)</span> <span class="token operator">||</span> window<span class="token punctuation">,</span> <span class="token operator">...</span>args</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    context<span class="token punctuation">.</span>$fn <span class="token operator">=</span> <span class="token keyword">this</span>
    <span class="token keyword">const</span> res <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">$fn</span><span class="token punctuation">(</span><span class="token operator">...</span>args<span class="token punctuation">)</span>
    <span class="token keyword">delete</span> context<span class="token punctuation">.</span>$fn
    <span class="token keyword">return</span> res
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token class-name">Function</span><span class="token punctuation">.</span>prototype<span class="token punctuation">)</span>
</code></pre></div><h2 id="手写apply函数"><a href="#手写apply函数" class="header-anchor">#</a> 手写apply函数</h2> <p>es5</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token operator">~</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">proto</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  proto<span class="token punctuation">.</span><span class="token function-variable function">myApply</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">context</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">var</span> args <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">splice</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>arguments<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    context <span class="token operator">=</span> <span class="token function">Object</span><span class="token punctuation">(</span>context<span class="token punctuation">)</span> <span class="token operator">||</span> window<span class="token punctuation">;</span>
    context<span class="token punctuation">.</span>fn <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
    <span class="token keyword">var</span> res <span class="token operator">=</span> <span class="token function">eval</span><span class="token punctuation">(</span><span class="token string">'context.fn('</span> <span class="token operator">+</span> args <span class="token operator">+</span> <span class="token string">')'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">delete</span> context<span class="token punctuation">.</span>fn<span class="token punctuation">;</span>
    <span class="token keyword">return</span> res<span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">(</span><span class="token class-name">Function</span><span class="token punctuation">.</span>prototype<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><p>es6</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">proto</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  proto<span class="token punctuation">.</span><span class="token function-variable function">myApply</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">context <span class="token operator">=</span> <span class="token function">Object</span><span class="token punctuation">(</span>context<span class="token punctuation">)</span> <span class="token operator">||</span> window<span class="token punctuation">,</span> <span class="token operator">...</span>args</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    context<span class="token punctuation">.</span>$fn <span class="token operator">=</span> <span class="token keyword">this</span>
    <span class="token keyword">const</span> res <span class="token operator">=</span> context<span class="token punctuation">.</span><span class="token function">$fn</span><span class="token punctuation">(</span><span class="token operator">...</span>args<span class="token punctuation">)</span>
    <span class="token keyword">delete</span> context<span class="token punctuation">.</span><span class="token function">$fn</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token keyword">return</span> res
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token class-name">Function</span><span class="token punctuation">.</span>prototype<span class="token punctuation">)</span>
</code></pre></div><h2 id="手写bind函数"><a href="#手写bind函数" class="header-anchor">#</a> 手写bind函数</h2> <p>方法一：</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">proto</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
  <span class="token keyword">function</span> <span class="token function">bind</span><span class="token punctuation">(</span><span class="token parameter">context</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>context<span class="token punctuation">)</span> context <span class="token operator">=</span> window
    <span class="token keyword">var</span> args <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>arguments<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span>
    <span class="token keyword">var</span> _this <span class="token operator">=</span> <span class="token keyword">this</span>
    <span class="token keyword">return</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">var</span> arg <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>arguments<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span>
      <span class="token function">_this</span><span class="token punctuation">.</span><span class="token function">apply</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> args<span class="token punctuation">.</span>conca <span class="token function">t</span><span class="token punctuation">(</span>arg<span class="token punctuation">)</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
  proto<span class="token punctuation">.</span>myBind <span class="token operator">=</span> bind
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token class-name">Function</span><span class="token punctuation">.</span>prototype<span class="token punctuation">)</span>
</code></pre></div><p>方法二：</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">proto</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
  <span class="token keyword">function</span> <span class="token function">bind</span><span class="token punctuation">(</span><span class="token parameter">context <span class="token operator">=</span> window<span class="token punctuation">,</span> <span class="token operator">...</span>args</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token punctuation">(</span><span class="token parameter"><span class="token operator">...</span>innerArgs</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> <span class="token operator">...</span>args<span class="token punctuation">,</span> <span class="token operator">...</span>innerArgs<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
  proto<span class="token punctuation">.</span>myBind <span class="token operator">=</span> bind
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token class-name">Function</span><span class="token punctuation">.</span>prototype<span class="token punctuation">)</span>
</code></pre></div><h2 id="手写new"><a href="#手写new" class="header-anchor">#</a> 手写new</h2> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">function</span> <span class="token function">new1</span><span class="token punctuation">(</span><span class="token parameter">func</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> o <span class="token operator">=</span> Object<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span>func<span class="token punctuation">.</span>prototype<span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">const</span> obj <span class="token operator">=</span> <span class="token function">func</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">return</span> <span class="token keyword">typeof</span> obj <span class="token operator">===</span> <span class="token string">'function'</span> <span class="token operator">?</span> obj <span class="token operator">:</span> o<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="手写instanceof"><a href="#手写instanceof" class="header-anchor">#</a> 手写instanceof</h2> <div class="language-js extra-class"><pre class="language-js"><code></code></pre></div><h2 id="手写拷贝"><a href="#手写拷贝" class="header-anchor">#</a> 手写拷贝</h2> <p>数组浅拷贝：</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">let</span> arr <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> arr1 <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token operator">...</span>arr<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> arr2 <span class="token operator">=</span> arr<span class="token punctuation">.</span><span class="token function">concat</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> arr3 <span class="token operator">=</span> arr<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><p>对象浅拷贝：</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">let</span> obj <span class="token operator">=</span> <span class="token punctuation">{</span>
    <span class="token number">0</span><span class="token operator">:</span> <span class="token string">'math'</span><span class="token punctuation">,</span>
    score<span class="token operator">:</span> <span class="token punctuation">{</span>
        english<span class="token operator">:</span> <span class="token number">90</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span>
    reg<span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">1</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
    time<span class="token operator">:</span> <span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">,</span>
    friends<span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">'tom'</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
    <span class="token function-variable function">say</span><span class="token operator">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
    tag<span class="token operator">:</span> <span class="token function">Symbol</span><span class="token punctuation">(</span><span class="token string">'tag'</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">[</span>Symbol<span class="token punctuation">.</span>toStringTag<span class="token punctuation">]</span><span class="token operator">:</span> <span class="token string">'object'</span>
<span class="token punctuation">}</span>

<span class="token keyword">let</span> obj1 <span class="token operator">=</span> <span class="token punctuation">{</span>
  <span class="token operator">...</span>obj
<span class="token punctuation">}</span>
<span class="token keyword">let</span> obj2 <span class="token operator">=</span> Object<span class="token punctuation">.</span><span class="token function">assign</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> obj<span class="token punctuation">)</span>
<span class="token comment">// 上面两种包含了原始对象的Symbol属性的处理</span>

<span class="token comment">// 不支持对 Symbol 属性的处理</span>
<span class="token keyword">let</span> objCopy <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> key <span class="token keyword">in</span> obj<span class="token punctuation">)</span> <span class="token punctuation">{</span>
  objCopy<span class="token punctuation">[</span>key<span class="token punctuation">]</span> <span class="token operator">=</span> obj<span class="token punctuation">[</span>key<span class="token punctuation">]</span>
<span class="token punctuation">}</span>
</code></pre></div><p>极简版的浅克隆（处理的情况比较少）：</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">function</span> <span class="token function">shallowClone</span><span class="token punctuation">(</span><span class="token parameter">obj</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> obj <span class="token operator">!==</span> <span class="token string">'object'</span> <span class="token operator">||</span> <span class="token keyword">typeof</span> obj <span class="token operator">===</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token keyword">return</span> obj<span class="token punctuation">;</span>
  <span class="token keyword">return</span> Array<span class="token punctuation">.</span><span class="token function">isArray</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token punctuation">[</span><span class="token operator">...</span>obj<span class="token punctuation">]</span> <span class="token operator">:</span> <span class="token punctuation">{</span><span class="token operator">...</span>obj<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p>相对完善的浅克隆：</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token punctuation">[</span><span class="token string">'Boolean'</span><span class="token punctuation">,</span> <span class="token string">'Number'</span><span class="token punctuation">,</span> <span class="token string">'String'</span><span class="token punctuation">,</span> <span class="token string">'Function'</span><span class="token punctuation">,</span> <span class="token string">'Array'</span><span class="token punctuation">,</span> <span class="token string">'Date'</span><span class="token punctuation">,</span> <span class="token string">'RegExp'</span><span class="token punctuation">,</span> <span class="token string">'Object'</span><span class="token punctuation">,</span> <span class="token string">'Error'</span><span class="token punctuation">,</span> <span class="token string">'Symbol'</span><span class="token punctuation">,</span> <span class="token string">'BigInt'</span><span class="token punctuation">]</span>
<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token parameter">name</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  class2type<span class="token punctuation">[</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">[object </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>name<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">]</span><span class="token template-punctuation string">`</span></span><span class="token punctuation">]</span> <span class="token operator">=</span> name<span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

<span class="token keyword">const</span> <span class="token function-variable function">toType</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">obj</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>obj <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token keyword">return</span> obj <span class="token operator">+</span> <span class="token string">''</span><span class="token punctuation">;</span>
  <span class="token keyword">return</span> <span class="token keyword">typeof</span> obj <span class="token operator">===</span> <span class="token string">'object'</span> <span class="token operator">||</span> <span class="token keyword">typeof</span> obj <span class="token operator">===</span> <span class="token string">'function'</span> <span class="token operator">?</span> class2type<span class="token punctuation">[</span><span class="token function">toString</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">]</span> <span class="token operator">||</span> <span class="token string">'object'</span> <span class="token operator">:</span>
    <span class="token keyword">typeof</span> obj<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token function">shallowClone</span><span class="token punctuation">(</span><span class="token parameter">obj</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> type <span class="token operator">=</span> <span class="token function">toType</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">,</span> Ctor <span class="token operator">=</span> obj<span class="token punctuation">.</span>constructor<span class="token punctuation">;</span>

  <span class="token comment">// Symbol/BigInt</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">^(symbol|bigint)$</span><span class="token regex-delimiter">/</span><span class="token regex-flags">i</span></span><span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span>type<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token function">Object</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token comment">// 正则和日期</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">^(regexp|date)$</span><span class="token regex-delimiter">/</span><span class="token regex-flags">i</span></span><span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span>type<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">Ctor</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token comment">// 错误对象的处理</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">^error$</span><span class="token regex-delimiter">/</span><span class="token regex-flags">i</span></span><span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span>type<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">Ctor</span><span class="token punctuation">(</span>obj<span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token comment">// 函数</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">^function$</span><span class="token regex-delimiter">/</span><span class="token regex-flags">i</span></span><span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span>type<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token function">obj</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>obj<span class="token punctuation">,</span> <span class="token operator">...</span>arguments<span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">;</span>

  <span class="token comment">// 数组对象</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">^(object|array)$</span><span class="token regex-delimiter">/</span><span class="token regex-flags">i</span></span><span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span>type<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">let</span> keys <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token operator">...</span>Object<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token operator">...</span>Object<span class="token punctuation">.</span><span class="token function">getOwnPropertySymbols</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">]</span>
    <span class="token keyword">const</span> res <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Ctor</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    keys<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token parameter">key</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      res<span class="token punctuation">[</span>key<span class="token punctuation">]</span> <span class="token operator">=</span> obj<span class="token punctuation">[</span>key<span class="token punctuation">]</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token keyword">return</span> res<span class="token punctuation">;</span>
  <span class="token punctuation">}</span>

  <span class="token keyword">return</span> obj<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p>简版的深克隆：</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">function</span> <span class="token function">isObject</span> <span class="token punctuation">(</span><span class="token parameter">obj</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> obj <span class="token operator">===</span> <span class="token string">'object'</span><span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> obj <span class="token operator">!==</span> <span class="token keyword">null</span>
<span class="token punctuation">}</span>
<span class="token keyword">function</span> <span class="token function">deepClone</span> <span class="token punctuation">(</span><span class="token parameter">obj</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">isObject</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> obj
  <span class="token punctuation">}</span>

  <span class="token keyword">const</span> newObj <span class="token operator">=</span> Array<span class="token punctuation">.</span><span class="token function">isArray</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token punctuation">[</span><span class="token punctuation">]</span> <span class="token operator">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
  Reflect<span class="token punctuation">.</span><span class="token function">ownKeys</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token parameter">key</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> value <span class="token operator">=</span> obj<span class="token punctuation">[</span>key<span class="token punctuation">]</span>
    newObj<span class="token punctuation">[</span>key<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token function">isObject</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token function">deepClone</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span> <span class="token operator">:</span> value
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token keyword">return</span> newObj
<span class="token punctuation">}</span>
</code></pre></div><p>相对完善些的深克隆：</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">function</span> <span class="token function">deepClone</span><span class="token punctuation">(</span>obj<span class="token punctuation">,</span> cache <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Set</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> type <span class="token operator">=</span> <span class="token function">toType</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">,</span>
    Ctor <span class="token operator">=</span> obj<span class="token punctuation">.</span>constructor<span class="token punctuation">;</span>

  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">^(object|array)$</span><span class="token regex-delimiter">/</span><span class="token regex-flags">i</span></span><span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span>type<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token function">shallowClone</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token comment">// 避免套娃</span>
  <span class="token keyword">if</span><span class="token punctuation">(</span>cache<span class="token punctuation">.</span><span class="token function">has</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">return</span> obj<span class="token punctuation">;</span>
  cache<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span>

  <span class="token keyword">let</span> res <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Ctor</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  Reflect<span class="token punctuation">.</span><span class="token function">ownKeys</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token parameter">key</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    res<span class="token punctuation">[</span>key<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token function">deepClone</span><span class="token punctuation">(</span>obj<span class="token punctuation">[</span>key<span class="token punctuation">]</span><span class="token punctuation">,</span> cache<span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token keyword">return</span> res<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="实现柯里化函数"><a href="#实现柯里化函数" class="header-anchor">#</a> 实现柯里化函数</h2> <h2 id="手写一个观察者模式"><a href="#手写一个观察者模式" class="header-anchor">#</a> 手写一个观察者模式</h2> <h2 id="手动实现eventemitter-发布订阅模式"><a href="#手动实现eventemitter-发布订阅模式" class="header-anchor">#</a> 手动实现EventEmitter(发布订阅模式)</h2> <h2 id="手动实现-object-assign"><a href="#手动实现-object-assign" class="header-anchor">#</a> 手动实现 Object.assign</h2> <h2 id="js格式化数字-每三位加逗号"><a href="#js格式化数字-每三位加逗号" class="header-anchor">#</a> js格式化数字(每三位加逗号)</h2> <h2 id="手写数组去重的方法"><a href="#手写数组去重的方法" class="header-anchor">#</a> 手写数组去重的方法?</h2> <h2 id="基于js实现ajax请求并发请求的控制"><a href="#基于js实现ajax请求并发请求的控制" class="header-anchor">#</a> 基于JS实现Ajax请求并发请求的控制</h2> <p>在平时开发中，我们都是通过promise对ajax请求进行封装。这里我们先说一下，通过promise来实现串行和并行操作。</p> <ul><li>串行：请求是异步的，需要等到上一个请求成功才能执行下一个请求。</li> <li>并行：同时发送多个请求，注意HTTP请求可以同时进行。但是因为js是单线程的，所以js的处理操作是一步一步来的。</li></ul> <h3 id="串行"><a href="#串行" class="header-anchor">#</a> 串行</h3> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> <span class="token function-variable function">delay</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">interval</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">Promise</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">resolve<span class="token punctuation">,</span> reject</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">resolve</span><span class="token punctuation">(</span>interval<span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span> interval<span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>

<span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">1000</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">res</span><span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>res<span class="token punctuation">)</span>
  <span class="token keyword">return</span> <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">2000</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">res</span><span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>res<span class="token punctuation">)</span>
  <span class="token keyword">return</span> <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">3000</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">res</span><span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>res<span class="token punctuation">)</span>
  <span class="token keyword">return</span> <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">4000</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">res</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>res<span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre></div><p>串行会从上到下依次执行。</p> <h3 id="并行"><a href="#并行" class="header-anchor">#</a> 并行</h3> <p>等到所有请求都成功后我们再做某些事情，我们可以使用promise.all来进行并行请求</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> <span class="token function-variable function">delay</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">interval</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">Promise</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">resolve<span class="token punctuation">,</span> reject</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">resolve</span><span class="token punctuation">(</span>interval<span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span> interval<span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> <span class="token function-variable function">fetchRequest</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">1000</span><span class="token punctuation">)</span>

<span class="token keyword">const</span> tasks <span class="token operator">=</span> <span class="token punctuation">[</span>
  <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">1000</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">2000</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">3000</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">4000</span><span class="token punctuation">)</span>
<span class="token punctuation">]</span>

Promise<span class="token punctuation">.</span><span class="token function">all</span><span class="token punctuation">(</span>tasks<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token parameter">task</span> <span class="token operator">=&gt;</span> <span class="token function">task</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">res</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>res<span class="token punctuation">)</span> <span class="token comment">// 四秒后输出 [1000, 2000, 3000, 4000]</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token parameter">err</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre></div><p>如果tasks里面的请求由有很多，在瞬间需要发出这么多的请求可能会带来一些问题。这个时候我们需要使用promise.all做并发限制。</p> <p>方法一：
方法二：</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">function</span> <span class="token function">delay</span><span class="token punctuation">(</span><span class="token parameter">ms</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">Promise</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">resolve<span class="token punctuation">,</span> reject</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">resolve</span><span class="token punctuation">(</span>ms<span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span> ms<span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> tasks <span class="token operator">=</span> <span class="token punctuation">[</span>
  <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">4000</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">3000</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">2000</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">delay</span><span class="token punctuation">(</span><span class="token number">1000</span><span class="token punctuation">)</span>
<span class="token punctuation">]</span>

<span class="token keyword">function</span> <span class="token function">createRequest</span><span class="token punctuation">(</span><span class="token parameter">tasks<span class="token punctuation">,</span> pool<span class="token punctuation">,</span> cb</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>pool <span class="token operator">&amp;&amp;</span> <span class="token keyword">typeof</span> pool <span class="token operator">===</span> <span class="token string">'function'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    pool <span class="token operator">=</span> <span class="token number">5</span>
    cb <span class="token operator">=</span> pool
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    pool <span class="token operator">=</span> pool <span class="token operator">||</span> <span class="token number">5</span>
  <span class="token punctuation">}</span>

  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> cb <span class="token operator">!==</span> <span class="token string">'function'</span><span class="token punctuation">)</span> <span class="token function-variable function">cb</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>

  <span class="token keyword">class</span> <span class="token class-name">TaskQueue</span> <span class="token punctuation">{</span>
    running <span class="token operator">=</span> <span class="token number">0</span>
    queue <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>
    results <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>

    <span class="token function">pushTask</span><span class="token punctuation">(</span><span class="token parameter">task</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>queue<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>task<span class="token punctuation">)</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
    <span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">while</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>running <span class="token operator">&lt;</span> pool <span class="token operator">&amp;&amp;</span> <span class="token keyword">this</span><span class="token punctuation">.</span>queue<span class="token punctuation">.</span>length<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>running<span class="token operator">++</span>
        <span class="token keyword">const</span> task <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>queue<span class="token punctuation">.</span><span class="token function">shift</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
        <span class="token function">task</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">result</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
          <span class="token keyword">this</span><span class="token punctuation">.</span>results<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>result<span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">finally</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
          <span class="token keyword">this</span><span class="token punctuation">.</span>running<span class="token operator">--</span>
          <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span>

      <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token keyword">this</span><span class="token punctuation">.</span>running<span class="token punctuation">)</span> <span class="token function">cb</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>results<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>

  <span class="token keyword">let</span> <span class="token constant">TQ</span> <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">TaskQueue</span>
  tasks<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token parameter">task</span> <span class="token operator">=&gt;</span> <span class="token constant">TQ</span><span class="token punctuation">.</span><span class="token function">pushTask</span><span class="token punctuation">(</span>task<span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>

<span class="token function">createRequest</span><span class="token punctuation">(</span>tasks<span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">res</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>res<span class="token punctuation">)</span> <span class="token comment">// [3000, 4000, 1000, 2000]</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre></div><p>从运行结果可以看出，使用上述方法实现的方式是乱序的。。</p> <h2 id="手写merge合并"><a href="#手写merge合并" class="header-anchor">#</a> 手写merge合并</h2> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> options <span class="token operator">=</span> <span class="token punctuation">{</span>
  url<span class="token operator">:</span> <span class="token string">''</span><span class="token punctuation">,</span>
  method<span class="token operator">:</span> <span class="token string">'get'</span><span class="token punctuation">,</span>
  headers<span class="token operator">:</span> <span class="token punctuation">{</span>
    <span class="token string">'Content-type'</span><span class="token operator">:</span> <span class="token string">'application/json'</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  data<span class="token operator">:</span> <span class="token keyword">null</span><span class="token punctuation">,</span>
  arr<span class="token operator">:</span> <span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
  config<span class="token operator">:</span> <span class="token punctuation">{</span>
    xhr<span class="token operator">:</span> <span class="token punctuation">{</span>
      async<span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
      cache<span class="token operator">:</span> <span class="token boolean">true</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> params <span class="token operator">=</span> <span class="token punctuation">{</span>
  url<span class="token operator">:</span> <span class="token string">'www.baidu.com'</span><span class="token punctuation">,</span>
  headers<span class="token operator">:</span> <span class="token punctuation">{</span>
    <span class="token string">'token'</span><span class="token operator">:</span> <span class="token string">'123'</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  data<span class="token operator">:</span> <span class="token punctuation">{</span>
    name<span class="token operator">:</span> <span class="token string">'f'</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  arr<span class="token operator">:</span> <span class="token punctuation">[</span><span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
  config<span class="token operator">:</span> <span class="token punctuation">{</span>
    xhr<span class="token operator">:</span> <span class="token punctuation">{</span>
      cache<span class="token operator">:</span> <span class="token boolean">true</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>


<span class="token keyword">function</span> <span class="token function">isObject</span><span class="token punctuation">(</span><span class="token parameter">obj</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token keyword">typeof</span> obj <span class="token operator">===</span> <span class="token string">'object'</span> <span class="token operator">&amp;&amp;</span> obj <span class="token operator">!==</span> <span class="token keyword">null</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token function">merge</span><span class="token punctuation">(</span><span class="token parameter">options<span class="token punctuation">,</span> params</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> key <span class="token keyword">in</span> params<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> isA <span class="token operator">=</span> <span class="token function">isObject</span><span class="token punctuation">(</span>options<span class="token punctuation">[</span>key<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
      isB <span class="token operator">=</span> <span class="token function">isObject</span><span class="token punctuation">(</span>params<span class="token punctuation">[</span>key<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>isA <span class="token operator">&amp;&amp;</span> <span class="token operator">!</span>isB<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">TypeError</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>key<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string"> in params must be object</span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>isA <span class="token operator">&amp;&amp;</span> isB<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      options<span class="token punctuation">[</span>key<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token function">merge</span><span class="token punctuation">(</span>options<span class="token punctuation">[</span>key<span class="token punctuation">]</span><span class="token punctuation">,</span> params<span class="token punctuation">[</span>key<span class="token punctuation">]</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token keyword">else</span> <span class="token punctuation">{</span>
      options<span class="token punctuation">[</span>key<span class="token punctuation">]</span> <span class="token operator">=</span> params<span class="token punctuation">[</span>key<span class="token punctuation">]</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
  <span class="token keyword">return</span> options
<span class="token punctuation">}</span>
</code></pre></div><h2 id="手写aop切片编程"><a href="#手写aop切片编程" class="header-anchor">#</a> 手写AOP切片编程</h2> <p>APO（面向切片编程）的主要作用是把一些跟核心业务逻辑模块无关的功能抽离出来，这些跟业务逻辑无关的功能通常包括日志统计、安全控制、异常处理等。把这些功能抽离出来后再通过动态植入的方式参入业务逻辑模块中。</p> <p>例子：</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token class-name">Function</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function-variable function">before</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">cb</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> cb <span class="token operator">!==</span> <span class="token string">'function'</span><span class="token punctuation">)</span> <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">TypeError</span><span class="token punctuation">(</span><span class="token string">'cb must be function'</span><span class="token punctuation">)</span>
  <span class="token keyword">const</span> self <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
  <span class="token keyword">return</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">cb</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token operator">...</span>arguments<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token function">self</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token operator">...</span>arguments<span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token class-name">Function</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function-variable function">after</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">cb</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> cb <span class="token operator">!==</span> <span class="token string">'function'</span><span class="token punctuation">)</span> <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">TypeError</span><span class="token punctuation">(</span><span class="token string">'cb must be function'</span><span class="token punctuation">)</span>
  <span class="token keyword">const</span> self <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
  <span class="token keyword">return</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> res <span class="token operator">=</span> <span class="token function">self</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token operator">...</span>arguments<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">cb</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token operator">...</span>arguments<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> res<span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">const</span> <span class="token function-variable function">func</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'func'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>

func<span class="token punctuation">.</span><span class="token function">before</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'before'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">after</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'after'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><h2 id="手写geturlparam"><a href="#手写geturlparam" class="header-anchor">#</a> 手写getUrlParam</h2> <p>方法一：</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">function</span> <span class="token function">getUrlParam</span><span class="token punctuation">(</span><span class="token parameter">name</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">let</span> res <span class="token operator">=</span> <span class="token string">''</span><span class="token punctuation">;</span>
  <span class="token keyword">const</span> str <span class="token operator">=</span> location<span class="token punctuation">.</span>search
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>str<span class="token punctuation">)</span> <span class="token keyword">return</span> res<span class="token punctuation">;</span>

  <span class="token keyword">const</span> arr <span class="token operator">=</span> str<span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">'?'</span><span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">'&amp;'</span><span class="token punctuation">)</span>
  arr<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token parameter">item</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> arr2 <span class="token operator">=</span> item<span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">'='</span><span class="token punctuation">)</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>arr2<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span> <span class="token operator">===</span> name<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      res <span class="token operator">=</span> arr2<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token keyword">return</span> res
<span class="token punctuation">}</span>
</code></pre></div><p>方法二：</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">function</span> <span class="token function">getUrlParam</span><span class="token punctuation">(</span><span class="token parameter">name</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
  <span class="token keyword">var</span> reg <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">RegExp</span><span class="token punctuation">(</span><span class="token string">'(^|&amp;)'</span> <span class="token operator">+</span> name <span class="token operator">+</span> <span class="token string">'=([^&amp;]*)(&amp;|$)'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>    
  <span class="token keyword">var</span> result <span class="token operator">=</span>  window<span class="token punctuation">.</span>location<span class="token punctuation">.</span>search<span class="token punctuation">.</span><span class="token function">substr</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">match</span><span class="token punctuation">(</span>reg<span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">return</span> result <span class="token operator">?</span> <span class="token function">decodeURIComponent</span><span class="token punctuation">(</span>result<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token operator">:</span> <span class="token keyword">null</span><span class="token punctuation">;</span>  
<span class="token punctuation">}</span>
</code></pre></div></div> <footer class="page-edit"><!----> <!----></footer> <div class="page-nav"><p class="inner"><span class="prev">
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